Assessing the temperature development with both, high temporal but also high spatial resolution is a key element in better understanding the physics at play of a composite material when degrading under a flame. While temperature measurements in flames are a challenge on its own, the experimental conditions are further impaired by the propensity of the electrically conducting carbon fibres to short-cut the thermocouple junctions placed throughout the panel. This limits the spatial resolution and alters the overall readings. The embedded thermocouples thus not only need to be electrically insulated but the insulation needs also to withstand the harsh experimental conditions while keeping the overall sensor size as small as possible. In an effort to solve this problem, a flame plating technique was developed to deposit thin layers of silica onto type K thermocouples. The procedure is entirely based on basic laboratory equipment and can be easily recreated. The coated thermocouples have been embedded in carbon fibre panels that were subjected to different heat sources. The approach allows to monitor in-situ temperature profiles of the degrading samples and have proven to be still functional even after complete carbonisation of the material. The temperature measurements are corroborated by additional IR-camera measurements.